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#1 2023-06-11 16:45:01
- hamelg
- Member
- From: France
- Registered: 2008-06-19
- Posts: 129
dvb broken with 6.3.7
My dvb-t adapter no longer works after upgrading linux kernel to 6.3.7. 6.3.6 works well.
On startup, Mythbackend hangs and these errors appear in the dmesg logs :
juin 11 16:02:56 darkstar kernel: INFO: task mythbackend:2659 blocked for more than 122 seconds.
juin 11 16:02:56 darkstar kernel: Tainted: G OE 6.3.7-arch1-1 #1
juin 11 16:02:56 darkstar kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
juin 11 16:02:56 darkstar kernel: task:mythbackend state:D stack:0 pid:2659 ppid:1 flags:0x00000002
juin 11 16:02:56 darkstar kernel: Call Trace:
juin 11 16:02:56 darkstar kernel: <TASK>
juin 11 16:02:56 darkstar kernel: __schedule+0x443/0x1400
juin 11 16:02:56 darkstar kernel: ? sysvec_apic_timer_interrupt+0xe/0x90
juin 11 16:02:56 darkstar kernel: schedule+0x5e/0xd0
juin 11 16:02:56 darkstar kernel: schedule_preempt_disabled+0x15/0x30
juin 11 16:02:56 darkstar kernel: __mutex_lock.constprop.0+0x39a/0x6a0
juin 11 16:02:56 darkstar kernel: ? drain_stock+0x5e/0xa0
juin 11 16:02:56 darkstar kernel: dvb_frontend_stop+0x3b/0x1e0 [dvb_core fa4ed5e13d63ae02972c3d6d952f98420ae6d574]
juin 11 16:02:56 darkstar kernel: ? __mod_memcg_lruvec_state+0x45/0x90
juin 11 16:02:56 darkstar kernel: ? mod_memcg_lruvec_state+0x15/0x30
juin 11 16:02:56 darkstar kernel: dvb_frontend_open+0x1ac/0x5b0 [dvb_core fa4ed5e13d63ae02972c3d6d952f98420ae6d574]
juin 11 16:02:56 darkstar kernel: dvb_device_open+0xbd/0x120 [dvb_core fa4ed5e13d63ae02972c3d6d952f98420ae6d574]
juin 11 16:02:56 darkstar kernel: chrdev_open+0xc8/0x250
juin 11 16:02:56 darkstar kernel: ? __pfx_chrdev_open+0x10/0x10
juin 11 16:02:56 darkstar kernel: do_dentry_open+0x1e5/0x460
juin 11 16:02:56 darkstar kernel: path_openat+0xd47/0x1170
juin 11 16:02:56 darkstar kernel: do_filp_open+0xb3/0x160
juin 11 16:02:56 darkstar kernel: do_sys_openat2+0xaf/0x170
juin 11 16:02:56 darkstar kernel: __x64_sys_openat+0x57/0xa0
juin 11 16:02:56 darkstar kernel: do_syscall_64+0x60/0x90
juin 11 16:02:56 darkstar kernel: ? syscall_exit_to_user_mode+0x1b/0x40
juin 11 16:02:56 darkstar kernel: ? do_syscall_64+0x6c/0x90
juin 11 16:02:56 darkstar kernel: ? exc_page_fault+0x7c/0x180
juin 11 16:02:56 darkstar kernel: entry_SYSCALL_64_after_hwframe+0x72/0xdc
juin 11 16:02:56 darkstar kernel: RIP: 0033:0x7f58f850f900
juin 11 16:02:56 darkstar kernel: RSP: 002b:00007ffc9c0e82f0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
juin 11 16:02:56 darkstar kernel: RAX: ffffffffffffffda RBX: 0000000000000802 RCX: 00007f58f850f900
juin 11 16:02:56 darkstar kernel: RDX: 0000000000000802 RSI: 0000563d19340d78 RDI: 00000000ffffff9c
juin 11 16:02:56 darkstar kernel: RBP: 0000563d19340d78 R08: 0000000000000000 R09: 0000000000000018
juin 11 16:02:56 darkstar kernel: R10: 0000000000000000 R11: 0000000000000293 R12: 0000563d1933c190
juin 11 16:02:56 darkstar kernel: R13: 00007ffc9c0e8388 R14: 00007ffc9c0e8390 R15: 00007ffc9c0e84f0
juin 11 16:02:56 darkstar kernel: </TASK>The culprit is a set of dvb-related fixes committed in 6.3.7. Some have reported the issue and a fix has been committed:
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#2 2023-06-12 15:56:39
- agapito
- Member
- From: Who cares.
- Registered: 2008-11-13
- Posts: 679
Re: dvb broken with 6.3.7
I had this problem and this patch fixes it:
---
drivers/media/dvb-core/dvb_frontend.c | 53 +++++----------------------
include/media/dvb_frontend.h | 6 +--
2 files changed, 10 insertions(+), 49 deletions(-)
diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c
index bc6950a5740f..9293b058ab99 100644
--- a/drivers/media/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb-core/dvb_frontend.c
@@ -817,26 +817,15 @@ static void dvb_frontend_stop(struct dvb_frontend *fe)
dev_dbg(fe->dvb->device, "%s:\n", __func__);
- mutex_lock(&fe->remove_mutex);
-
if (fe->exit != DVB_FE_DEVICE_REMOVED)
fe->exit = DVB_FE_NORMAL_EXIT;
mb();
- if (!fepriv->thread) {
- mutex_unlock(&fe->remove_mutex);
+ if (!fepriv->thread)
return;
- }
kthread_stop(fepriv->thread);
- mutex_unlock(&fe->remove_mutex);
-
- if (fepriv->dvbdev->users < -1) {
- wait_event(fepriv->dvbdev->wait_queue,
- fepriv->dvbdev->users == -1);
- }
-
sema_init(&fepriv->sem, 1);
fepriv->state = FESTATE_IDLE;
@@ -2780,13 +2769,9 @@ static int dvb_frontend_open(struct inode *inode, struct file *file)
struct dvb_adapter *adapter = fe->dvb;
int ret;
- mutex_lock(&fe->remove_mutex);
-
dev_dbg(fe->dvb->device, "%s:\n", __func__);
- if (fe->exit == DVB_FE_DEVICE_REMOVED) {
- ret = -ENODEV;
- goto err_remove_mutex;
- }
+ if (fe->exit == DVB_FE_DEVICE_REMOVED)
+ return -ENODEV;
if (adapter->mfe_shared == 2) {
mutex_lock(&adapter->mfe_lock);
@@ -2794,8 +2779,7 @@ static int dvb_frontend_open(struct inode *inode, struct file *file)
if (adapter->mfe_dvbdev &&
!adapter->mfe_dvbdev->writers) {
mutex_unlock(&adapter->mfe_lock);
- ret = -EBUSY;
- goto err_remove_mutex;
+ return -EBUSY;
}
adapter->mfe_dvbdev = dvbdev;
}
@@ -2818,10 +2802,8 @@ static int dvb_frontend_open(struct inode *inode, struct file *file)
while (mferetry-- && (mfedev->users != -1 ||
mfepriv->thread)) {
if (msleep_interruptible(500)) {
- if (signal_pending(current)) {
- ret = -EINTR;
- goto err_remove_mutex;
- }
+ if (signal_pending(current))
+ return -EINTR;
}
}
@@ -2833,8 +2815,7 @@ static int dvb_frontend_open(struct inode *inode, struct file *file)
if (mfedev->users != -1 ||
mfepriv->thread) {
mutex_unlock(&adapter->mfe_lock);
- ret = -EBUSY;
- goto err_remove_mutex;
+ return -EBUSY;
}
adapter->mfe_dvbdev = dvbdev;
}
@@ -2893,8 +2874,6 @@ static int dvb_frontend_open(struct inode *inode, struct file *file)
if (adapter->mfe_shared)
mutex_unlock(&adapter->mfe_lock);
-
- mutex_unlock(&fe->remove_mutex);
return ret;
err3:
@@ -2916,9 +2895,6 @@ static int dvb_frontend_open(struct inode *inode, struct file *file)
err0:
if (adapter->mfe_shared)
mutex_unlock(&adapter->mfe_lock);
-
-err_remove_mutex:
- mutex_unlock(&fe->remove_mutex);
return ret;
}
@@ -2929,8 +2905,6 @@ static int dvb_frontend_release(struct inode *inode, struct file *file)
struct dvb_frontend_private *fepriv = fe->frontend_priv;
int ret;
- mutex_lock(&fe->remove_mutex);
-
dev_dbg(fe->dvb->device, "%s:\n", __func__);
if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
@@ -2952,18 +2926,10 @@ static int dvb_frontend_release(struct inode *inode, struct file *file)
}
mutex_unlock(&fe->dvb->mdev_lock);
#endif
+ if (fe->exit != DVB_FE_NO_EXIT)
+ wake_up(&dvbdev->wait_queue);
if (fe->ops.ts_bus_ctrl)
fe->ops.ts_bus_ctrl(fe, 0);
-
- if (fe->exit != DVB_FE_NO_EXIT) {
- mutex_unlock(&fe->remove_mutex);
- wake_up(&dvbdev->wait_queue);
- } else {
- mutex_unlock(&fe->remove_mutex);
- }
-
- } else {
- mutex_unlock(&fe->remove_mutex);
}
dvb_frontend_put(fe);
@@ -3064,7 +3030,6 @@ int dvb_register_frontend(struct dvb_adapter *dvb,
fepriv = fe->frontend_priv;
kref_init(&fe->refcount);
- mutex_init(&fe->remove_mutex);
/*
* After initialization, there need to be two references: one
diff --git a/include/media/dvb_frontend.h b/include/media/dvb_frontend.h
index 367d5381217b..e7c44870f20d 100644
--- a/include/media/dvb_frontend.h
+++ b/include/media/dvb_frontend.h
@@ -686,10 +686,7 @@ struct dtv_frontend_properties {
* @id: Frontend ID
* @exit: Used to inform the DVB core that the frontend
* thread should exit (usually, means that the hardware
- * got disconnected).
- * @remove_mutex: mutex that avoids a race condition between a callback
- * called when the hardware is disconnected and the
- * file_operations of dvb_frontend.
+ * got disconnected.
*/
struct dvb_frontend {
@@ -707,7 +704,6 @@ struct dvb_frontend {
int (*callback)(void *adapter_priv, int component, int cmd, int arg);
int id;
unsigned int exit;
- struct mutex remove_mutex;
};
/**
--
Excuse my poor English.
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#3 2023-06-16 08:13:05
- C-Klaus
- Member
- Registered: 2015-04-29
- Posts: 23
Re: dvb broken with 6.3.7
Same problem here running tvheadend using dvb-s even with newest kernel 6.3.8. With kernel 6.3.6 all is fine.
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#4 2023-06-17 12:47:07
- loqs
- Member
- Registered: 2014-03-06
- Posts: 18,140
Re: dvb broken with 6.3.7
C-Klaus wrote:
Same problem here running tvheadend using dvb-s even with newest kernel 6.3.8.
Edit:
Queued for 6.3.9
https://git.kernel.org/pub/scm/linux/ke … 6476812f63
Last edited by loqs (2023-06-18 14:44:24)
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